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McFadden RML, Szunyogh D, Bravo‐Frank N, Chatzichristos A, Dehn MH, Fujimoto D, Jancsó A, Johannsen S, Kálomista I, Karner VL, Kiefl RF, Larsen FH, Lassen J, Levy CDP, Li R, McKenzie I, McPhee H, Morris GD, Pearson MR, Sauer SPA, Sigel RKO, Thulstrup PW, MacFarlane WA, Hemmingsen L, Stachura M. Magnesium(II)‐ATP Complexes in 1‐Ethyl‐3‐Methylimidazolium Acetate Solutions Characterized by
31
Mg β‐Radiation‐Detected NMR Spectroscopy. Angew Chem Int Ed Engl 2022; 61:e202207137. [PMID: 35718746 PMCID: PMC9539566 DOI: 10.1002/anie.202207137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Indexed: 11/26/2022]
Abstract
The complexation of MgII with adenosine 5′‐triphosphate (ATP) is omnipresent in biochemical energy conversion, but is difficult to interrogate directly. Here we use the spin‐1/2
β‐emitter 31Mg to study MgII‐ATP complexation in 1‐ethyl‐3‐methylimidazolium acetate (EMIM‐Ac) solutions using β‐radiation‐detected nuclear magnetic resonance (β‐NMR). We demonstrate that (nuclear) spin‐polarized 31Mg, following ion‐implantation from an accelerator beamline into EMIM‐Ac, binds to ATP within its radioactive lifetime before depolarizing. The evolution of the spectra with solute concentration indicates that the implanted 31Mg initially bind to the solvent acetate anions, whereafter they undergo dynamic exchange and form either a mono‐ (31Mg‐ATP) or di‐nuclear (31MgMg‐ATP) complex. The chemical shift of 31Mg‐ATP is observed up‐field of 31MgMg‐ATP, in accord with quantum chemical calculations. These observations constitute a crucial advance towards using β‐NMR to probe chemistry and biochemistry in solution.
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Affiliation(s)
| | - Dániel Szunyogh
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Nicholas Bravo‐Frank
- Faculty of Engineering University of Victoria 3800 Finnerty Road Victoria BC V8P 5C2 Canada
| | - Aris Chatzichristos
- Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada
- Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada
| | - Martin H. Dehn
- Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada
- Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada
| | - Derek Fujimoto
- Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada
- Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry University of Szeged Dóm tér 7 6720 Szeged Hungary
| | - Silke Johannsen
- Department of Chemistry University of Zurich Winterthurerstrasse 190 8057 Zürich Switzerland
| | - Ildikó Kálomista
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Victoria L. Karner
- Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada
- Department of Chemistry University of British Columbia 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Robert F. Kiefl
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
- Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada
- Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada
| | - Flemming H. Larsen
- Department of Food Science University of Copenhagen Rolighedsvej 26 1958 Frederiksberg Denmark
| | - Jens Lassen
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
- Department of Physics Simon Fraser University 8888 University Drive Burnaby BC V5A 1S6 Canada
- Department of Physics and Astronomy University of Manitoba 30A Sifton Road Winnipeg MB R3T 2N2 Canada
| | | | - Ruohong Li
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
| | - Iain McKenzie
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
- Department of Chemistry Simon Fraser University 8888 University Drive Burnaby BC V5A 1S6 Canada
- Department of Physics and Astronomy University of Waterloo 200 University Avenue West Waterloo ON N2L 3G1 Canada
| | - Hannah McPhee
- Department of Engineering McMaster University 1280 Main Street West Hamilton ON L8S 4L7 Canada
| | | | | | - Stephan P. A. Sauer
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Roland K. O. Sigel
- Department of Chemistry University of Zurich Winterthurerstrasse 190 8057 Zürich Switzerland
| | - Peter W. Thulstrup
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - W. Andrew MacFarlane
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
- Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada
- Department of Chemistry University of British Columbia 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Lars Hemmingsen
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Monika Stachura
- TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
- Department of Chemistry Simon Fraser University 8888 University Drive Burnaby BC V5A 1S6 Canada
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McFadden RML, Szunyogh D, Bravo-Frank N, Chatzichristos A, Dehn MH, Fujimoto D, Jancsó A, Johannsen S, Kálomista I, Karner VL, Kiefl RF, Larsen FH, Lassen J, Levy CDP, Li R, McKenzie I, McPhee H, Morris GD, Pearson MR, Sauer SPA, Sigel RKO, Thulstrup PW, MacFarlane WA, Hemmingsen L, Stachura M. Magnesium(II)‐ATP Complexes in 1‐Ethyl‐3‐Methylimidazolium Acetate Solutions Characterized by 31Mg β‐Radiation‐Detected NMR Spectroscopy. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Dániel Szunyogh
- University of Copenhagen: Kobenhavns Universitet Department of Chemistry DENMARK
| | - Nicholas Bravo-Frank
- University of Victoria Faculty of Engineering: University of Victoria Faculty of Engineering & Computer Science Faculty of Engineering CANADA
| | - Aris Chatzichristos
- The University of British Columbia Department of Physics and Astronomy CANADA
| | - Martin H. Dehn
- The University of British Columbia Department of Physics and Astronomy CANADA
| | - Derek Fujimoto
- The University of British Columbia Department of Physics and Astronomy CANADA
| | - Attila Jancsó
- University of Szeged: Szegedi Tudomanyegyetem Department of Inorganic and Analytical Chemistry HUNGARY
| | - Silke Johannsen
- University of Zurich: Universitat Zurich Department of Chemistry SWITZERLAND
| | - Ildikó Kálomista
- University of Copenhagen: Kobenhavns Universitet Department of Chemistry DENMARK
| | | | - Robert F. Kiefl
- The University of British Columbia Department of Physics and Astronomy CANADA
| | - Flemming H. Larsen
- University of Copenhagen: Kobenhavns Universitet Department of Food Science DENMARK
| | | | | | | | | | - Hannah McPhee
- McMaster University Department of Engineering Physics CANADA
| | | | | | - Stephan P. A. Sauer
- University of Copenhagen: Kobenhavns Universitet Department of Chemistry DENMARK
| | - Roland K. O. Sigel
- University of Zurich: Universitat Zurich Department of Chemistry SWITZERLAND
| | - Peter W. Thulstrup
- University of Copenhagen: Kobenhavns Universitet Department of Chemistry DENMARK
| | | | - Lars Hemmingsen
- University of Copenhagen: Kobenhavns Universitet Department of Chemistry DENMARK
| | - Monika Stachura
- TRIUMF Life Sciences Division 4004 Wesbrook Mall V6T 2A3 Vancouver CANADA
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3
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Li W, Zhang Q, Joos JJ, Smet PF, Schmedt Auf der Günne J. Blind spheres of paramagnetic dopants in solid state NMR. Phys Chem Chem Phys 2019; 21:10185-10194. [PMID: 31063169 DOI: 10.1039/c9cp00953a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Solid-state NMR on paramagnetically doped crystal structures gives information about the spatial distribution of dopants in the host. Paramagnetic dopants may render NMR active nuclei virtually invisible by relaxation, paramagnetic broadening or shielding. In this contribution blind sphere radii r0 have been reported, which could be extracted through fitting the NMR signal visibility function f(x) = exp(-ar03x) to experimental data obtained on several model compound series: La1-xLnxPO4 (Ln = Nd, Sm, Gd, Dy, Ho, Er, Tm, Yb), Sr1-xEuxGa2S4 and (Zn1-xMnx)3(PO4)2·4H2O. Radii were extracted for 1H, 31P and 71Ga, and dopants like Nd3+, Gd3+, Dy3+, Ho3+, Er3+, Tm3+, Yb3+ and Mn2+. The observed radii determined differed in all cases and covered a range from 5.5 to 13.5 Å. While these radii were obtained from the amount of invisible NMR signal, we also show how to link the visibility function to lineshape parameters. We show under which conditions empirical correlations of linewidth and doping concentration can be used to extract blind sphere radii from second moment or linewidth parameter data. From the second moment analysis of La1-xSmxPO431P MAS NMR spectra for example, a blind sphere size of Sm3+ can be determined, even though the visibility function remains close to 100% over the entire doping range. Dependence of the blind sphere radius r0 on the NMR isotope and on the paramagnetic dopant could be suggested and verified: for different nuclei, r0 shows a -dependence, γ being the gyromagnetic ratio. The blind sphere radii r0 for different paramagnetic dopants in a lanthanide series could be predicted from the pseudo-contact term.
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Affiliation(s)
- Wenyu Li
- Inorganic Materials Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
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4
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Kaseman DC, Gulbiten O, Aitken BG, Sen S. Isotropic rotation vs. shear relaxation in supercooled liquids with globular cage molecules. J Chem Phys 2016; 144:174501. [DOI: 10.1063/1.4947479] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Derrick C. Kaseman
- Division of Materials Science, University of California at Davis, Davis, California 95616, USA
| | - Ozgur Gulbiten
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA
| | - Bruce G. Aitken
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA
| | - Sabyasachi Sen
- Division of Materials Science, University of California at Davis, Davis, California 95616, USA
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5
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Chamberlin RV, Schiener B, Böhmer R. Slow Dielectric Relaxation of Supercooled Liqutos Investigated by Nonresonant Spectral Hole Burning. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-455-117] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWhen supercooled propylene carbonate and glycerol are subjected to a large-amplitude, low-frequency electric field, a spectral hole develops in their dielectric relaxation that is significantly narrower than their bulk response. This observation of nonresonant spectral hole burning establishes that the non-Debye response is due to a distribution of relaxation times. Refilling of the spectral hole occurs abruptly, indicative of a single recovery rate that corresponds to the peak in the distribution. The general shape of the spectral hole is preserved during recovery, indicating negligible interaction between the degrees of freedom that responded to the field. All relevant features in the behavior can be characterized by a model for independently relaxing domains that are selectively heated by the large oscillation, and which recover via connection to a common thermal bath, with no direct coupling between the domains.
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6
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Oumellal Y, Delpuech N, Mazouzi D, Dupré N, Gaubicher J, Moreau P, Soudan P, Lestriez B, Guyomard D. The failure mechanism of nano-sized Si-based negative electrodes for lithium ion batteries. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10213c] [Citation(s) in RCA: 287] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Levchenko AA, Jain P, Trofymluk O, Yu P, Navrotsky A, Sen S. Nature of Molecular Rotation in Supercooled Glycerol under Nanoconfinement. J Phys Chem B 2010; 114:3070-4. [DOI: 10.1021/jp911821p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrey A. Levchenko
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
| | - Pragati Jain
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
| | - Olga Trofymluk
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
| | - Ping Yu
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
| | - Alexandra Navrotsky
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
| | - Sabyasachi Sen
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616,
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8
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Mackowiak SA, Herman TK, Kaufman LJ. Spatial and temporal heterogeneity in supercooled glycerol: Evidence from wide field single molecule imaging. J Chem Phys 2009; 131:244513. [DOI: 10.1063/1.3277141] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Hoffmann MM, Sobstyl HS, Badali VA. T2 relaxation measurement with solvent suppression and implications to solvent suppression in general. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47:593-600. [PMID: 19373850 DOI: 10.1002/mrc.2434] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A number of suppression pulse sequences including Excitation Sculpting and WATERGATE were incorporated into the standard Carr-Purcell-Meiboom-Gill (CPMG) program for T(2) measurement and experimentally evaluated. The chosen suppression schemes were of varying complexity encompassing pulse program elements, such as presaturation, gradients, and selective pulses, which are typically utilized for solvent suppression. The quality of the spectral data and the accuracy of T(2) measurements of the investigated suppression schemes were evaluated using three aqueous samples with increasing proton content in the water solvent, i.e. by volume 100% D(2)O, 80/20% D(2)O/H(2)O, and 20/80% D(2)O/H(2)O. For signals removed from the water signal, the T(2) values were generally very consistent between all pulse sequences tested. T(2) measurements can be unreliable for signals too close to the water signal such that they are significantly suppressed as well. Their intensity may actually grow initially through cross relaxation that transfers magnetization back to the solute signal. In turn, this relaxation phenomenon can be exploited to improve the spectral quality of conventional solvent suppression schemes. In favorable cases, even signals that are completely masked by the water signal can be recovered by adding a carefully chosen number of spin echoes with optimized evolution time to conventional water suppression pulse programs, such as Excitation Sculpting or WATERGATE.
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Affiliation(s)
- Markus M Hoffmann
- Department of Chemistry, The College at Brockport, State University of New York, 350 New Campus Drive, Brockport, NY 14420, USA.
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10
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Jain P, Levchenko A, Yu P, Sen S. Molecular dynamics in supercooled glycerol: Results from C13 NMR spectroscopy. J Chem Phys 2009; 130:194506. [DOI: 10.1063/1.3138179] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Key B, Bhattacharyya R, Morcrette M, Seznéc V, Tarascon JM, Grey CP. Real-Time NMR Investigations of Structural Changes in Silicon Electrodes for Lithium-Ion Batteries. J Am Chem Soc 2009; 131:9239-49. [PMID: 19298062 DOI: 10.1021/ja8086278] [Citation(s) in RCA: 254] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baris Key
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
| | - Rangeet Bhattacharyya
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
| | - Mathieu Morcrette
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
| | - Vincent Seznéc
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
| | - Jean-Marie Tarascon
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
| | - Clare P. Grey
- Department of Chemistry, SUNY at Stony Brook, Stony Brook, New York 11794-3400, and LRCS, CNRS-UMR6007 Université de Picardie Jules Verne, 33 Rue Saint Leu 80039, Amiens, France
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12
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Todica M, Blümich B. Hole-burning NMR in strongly inhomogeneous fields. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2007; 32:66-70. [PMID: 17728115 DOI: 10.1016/j.ssnmr.2007.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Revised: 06/11/2007] [Accepted: 06/12/2007] [Indexed: 05/17/2023]
Abstract
Different pulse sequences for frequency-selective NMR in the highly inhomogeneous fields of single-sided NMR are explored. A modified Hahn-echo is used to burn a hole in the spectrum of the detected echo. The hole diminishes following molecular dynamics on the scale of the echo time. Preliminary experiments were performed on pure water and natural rubber with the NMR-MOUSE. The results demonstrate the feasibility of hole burning to study slow molecular dynamics by mobile NMR in strongly inhomogeneous magnetic fields.
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Affiliation(s)
- M Todica
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu Nr. 1, 400084 Cluj-Napoca, Romania.
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13
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Dzuba SA, Kirilina EP, Salnikov ES, Kulik LV. Restricted orientational motion of nitroxides in molecular glasses: Direct estimation of the motional time scale basing on the comparative study of primary and stimulated electron spin echo decays. J Chem Phys 2005; 122:094702. [PMID: 15836157 DOI: 10.1063/1.1856926] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A comparative study of anisotropic relaxation in two-pulse primary and three-pulse stimulated electron spin echo decays provides a direct way to distinguish fast (correlation time tau(c)<10(-6) s) and slow (tau(c)>10(-6) s) motions. Anisotropic relaxation is detected as a difference of the decay rates for different resonance field positions in anisotropic electron paramagnetic resonance spectra. For fast motion anisotropic relaxation influences the primary echo decay and does not influence the stimulated echo decay. For slow motion it is seen in both two-pulse echo and three-pulse stimulated echo decays. For nitroxide spin probes dissolved in glassy glycerol only fast motion was found below 200 K. Increase of temperature above 200 K results in the appearance of slow motion. Its amplitude increases rapidly with temperature increase. While in glycerol glass slow motion appears above glass transition temperature T(g), in ethanol glass it is observable below T(g). The scenario of motional dynamics in glasses is proposed which involves the broadening of the correlation time distribution with increasing temperature.
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Affiliation(s)
- S A Dzuba
- Institute of Chemical Kinetics and Combustion, Institutskaya 3, 630090 Novosibirsk, Russia.
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14
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Fung BM, Ermakov VL. The presence of long-lived spin states in organic solids with rapid molecular motions. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2004; 169:351-359. [PMID: 15261633 DOI: 10.1016/j.jmr.2004.04.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2003] [Revised: 01/21/2004] [Indexed: 05/24/2023]
Abstract
For organic solids with sufficiently mobile molecular segments, the application of a long and weak pulse (gammaB1/2pi approximately Hz) can yield inverted sharp peaks with linewidths of approximately 100 Hz in the 1H NMR spectra, and the use of multi-frequency weak pulses can excite multiple inverted sharp peaks. For these compounds, the normal 1H free induction decay (FID) of a static sample contains a slowly decaying part, which can be detected by acquisition delay up to about 2 ms. The presence of highly mobile molecular segments can also be identified by using a "dipolar filter."
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Affiliation(s)
- B M Fung
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019-3051, USA.
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15
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Fung BM, Ermakov VL. Selective excitation in spin systems with homogeneous broadening. J Chem Phys 2004; 120:9624-9. [PMID: 15267975 DOI: 10.1063/1.1711600] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have found that the application of a weak radio frequency (rf) pulse to a spin system with indirect spin-spin (J) couplings can produce a narrow inverted peak in spectral regions where there are many overlapping peaks. Examples of three compounds with (1)H-(1)H J couplings and one with (1)H-(13)C J couplings are given. The dependences of the signals on the frequency, duration, and amplitude of the weak rf irradiation have been studied. For an rf power of gammaB(1)/2pi=1.0 Hz, pulse widths longer than 0.25 s consistently produce inverted narrow peaks in spectral regions with unresolved peaks. An interpretation of the origin of this unusual result of selective excitation in spin systems with homogeneous broadening is given: the inverted signal observed can be considered as a cumulative effect of the weak rf irradiation acting on many uncorrelated transitions that are slightly off resonance on both sides of the irradiating frequency; the only role of the J couplings (or dipolar couplings in liquid crystals) is to produce a large number of closely spaced peaks that overlap with each other. Computer simulations of both coupled and noninteracting spin systems have been carried out, and the results support this interpretation.
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Affiliation(s)
- B M Fung
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019-3051, USA.
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16
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Sigmund EE, Halperin WP. Hole-burning diffusion measurements in high magnetic field gradients. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2003; 163:99-104. [PMID: 12852912 DOI: 10.1016/s1090-7807(03)00133-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We describe methods for the measurement of translational diffusion in very large static magnetic field gradients by NMR. The techniques use a "hole-burning" sequence that, with the use of fringe field gradients of 42 T/m, can image diffusion along one dimension on a submicron scale. Two varieties of this method are demonstrated, including a particularly efficient mode called the "hole-comb," in which multiple diffusion times comprising an entire diffusive evolution can be measured within the span of a single detected slice. The advantages and disadvantages of these methods are discussed, as well as their potential for addressing non-Fickian diffusion, diffusion in restricted media, and spatially inhomogeneous diffusion.
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Affiliation(s)
- E E Sigmund
- Northwestern University, Department of Physics and Astronomy, Evanston, IL 60208, USA.
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17
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Böhmer R, Hinze G. Reorientations in supercooled glycerol studied by two-dimensional time-domain deuteron nuclear magnetic resonance spectroscopy. J Chem Phys 1998. [DOI: 10.1063/1.476557] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Hemminga MA. Sensitivity of Saturation Transfer Electron Spin Resonance Extended to Extremely Slow Mobility in Glassy Materials. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1998; 131:241-7. [PMID: 9571099 DOI: 10.1006/jmre.1997.1354] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A novel extension of the saturation transfer (ST) ESR technique that enables the determination of extremely long rotational correlation times of nitroxide spin labels up to values around 10(4) s is proposed. The method is based on the observation that the integral of ST-ESR spectra is sensitive to the spin-lattice relaxation time of the electron of the spin label, which in turn is directly dependent upon the rotational correlation time. The method is applied to the spin label TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl) in glycerol. From the known viscosity data and the related rotational correlation times of the TEMPOL spin label in glycerol, the rotational correlation times of unknown samples can be determined. The method is especially applicable to systems with a very high viscosity, such as glassy materials. The method is applied to a 20 wt% glucose-water mixture in the glassy state, giving a value for the highest limiting rotational correlation time of about 10(3) s at a temperature of 45 K below the glass transition temperature of this system. This is an extension by six decades for the rotational correlation time, as compared to the current application of ST-ESR. Copyright 1998 Academic Press.
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19
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Hill EA, Yesinowski JP. Solid-state N14 nuclear magnetic resonance techniques for studying slow molecular motions. J Chem Phys 1997. [DOI: 10.1063/1.474609] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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de Souza IC, Mendes LG, Engelsberg M, de Souza RE. Rotating frame proton spin-lattice relaxation in the glass transition region: a study of glycerol. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(96)01379-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Schiener B, Bohmer R, Loidl A, Chamberlin RV. Nonresonant Spectral Hole Burning in the Slow Dielectric Response of Supercooled Liquids. Science 1996. [DOI: 10.1126/science.274.5288.752] [Citation(s) in RCA: 307] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Wuttke J, Petry W, Pouget S. Structural relaxation in viscous glycerol: Coherent neutron scattering. J Chem Phys 1996. [DOI: 10.1063/1.472336] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Brown MJ, Vold RL, Hoatson GL. Selective inversion investigations of slow molecular motion in solid state deuteron NMR spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 1996; 6:167-185. [PMID: 8784956 DOI: 10.1016/0926-2040(95)01213-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Deuteron selective inversion experiments are reported for polycrystalline dimethyl sulfone-d6 as a function of temperature from 288 to 333 K. Double side-band modulation was used to achieve efficient off-resonance orientation-selective inversion. Fitting the selective inversion-recovery curves to two-site jump equations yields the motional rate. Temperature dependent jump rates, obtained from both selective inversion and deuteron quadrupole echo lineshapes, give an activation energy Ea = 86.5 +/- 1.4 kJ mol-1 and a frequency factor In(A) = 39.2 +/- 0.5. These values differ significantly from those of earlier 13C lineshape studies. At 298 K, variable power excitation was used to determine the underlying orientation dependent homogeneous linewidth, which is predominantly dipolar. The temperature dependence of the homogeneous linewidth is a sensitive indicator of large angle jump motion in the range 10(3)-10(4) s-1.
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Affiliation(s)
- M J Brown
- Department of Physics, College of William and Mary, Williamsburg, VA 23187-8795, USA
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Grubbs WT, MacPhail RA. Dynamics in supercooled glycerol by high resolution stimulated Brillouin gain spectroscopy. J Chem Phys 1994. [DOI: 10.1063/1.466503] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Iwai S, Hattori M, Nakamura D, Ikeda R. Ionic dynamics in the rotator phase of n-alkylammonium chlorides (C6–C10), studied by1H nuclear magnetic resonance, electrical conductivity and thermal measurements. ACTA ACUST UNITED AC 1993. [DOI: 10.1039/ft9938900827] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rössler E. Corresponding states analysis for viscosity and nuclear magnetic resonance data in the glass transition regime. J Chem Phys 1990. [DOI: 10.1063/1.457830] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Iben IE, Braunstein D, Doster W, Frauenfelder H, Hong MK, Johnson JB, Luck S, Ormos P, Schulte A, Steinbach PJ, Xie AH, Young RD. Glassy behavior of a protein. PHYSICAL REVIEW LETTERS 1989; 62:1916-1919. [PMID: 10039803 DOI: 10.1103/physrevlett.62.1916] [Citation(s) in RCA: 251] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ansari A, Berendzen J, Braunstein D, Cowen BR, Frauenfelder H, Hong MK, Iben IE, Johnson JB, Ormos P, Sauke TB. Rebinding and relaxation in the myoglobin pocket. Biophys Chem 1987; 26:337-55. [PMID: 3607234 DOI: 10.1016/0301-4622(87)80034-0] [Citation(s) in RCA: 320] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The infrared stretching bands of carboxymyoglobin (MbCO) and the rebinding of CO to Mb after photodissociation have been studied in the temperature range 10-300 K in a variety of solvents. Four stretching bands imply that MbCO can exist in four substates, A0-A3. The temperature dependences of the intensities of the four bands yield the relative binding enthalpies and and entropies. The integrated absorbances and pH dependences of the bands permit identification of the substates with the conformations observed in the X-ray data (Kuriyan et al., J. Mol. Biol. 192 (1986) 133). At low pH, A0 is hydrogen-bonded to His E7. The substates A0-A3 interconvert above about 180 K in a 75% glycerol/water solvent and above 270 K in buffered water. No major interconversion is seen at any temperature if MbCO is embedded in a solid polyvinyl alcohol matrix. The dependence of the transition on solvent characteristics is explained as a slaved glass transition. After photodissociation at low temperature the CO is in the heme pocket B. The resulting CO stretching bands which are identified as B substates are blue-shifted from those of the A substates. At 40 K, rebinding after flash photolysis has been studied in the Soret, the near-infrared, and the integrated A and B substates. All data lie on the same rebinding curve and demonstrate that rebinding is nonexponential in time from at least 100 ns to 100 ks. No evidence for discrete exponentials is found. Flash photolysis with monitoring in the infrared region shows four different pathways within the pocket B to the bound substates Ai. Rebinding in each of the four pathways B----A is nonexponential in time to at least 10 ks and the four pathways have different kinetics below 180 K. From the time and temperature dependence of the rebinding, activation enthalpy distributions g(HBA) and preexponentials ABA are extracted. No pumping from one A substate to another, or one B substate to another, is observed below the transition temperature of about 180 K. If MbCO is exposed to intense white light for 10-10(3) s before being fully photolyzed by a laser flash, the amplitude of the long-lived states increases. The effect is explained in terms of a hierarchy of substates and substate symmetry breaking. The characteristics of the CO stretching bands and of the rebinding processes in the heme pocket depend strongly on the external parameters of solvent, pH and pressure. This sensitivity suggests possible control mechanisms for protein reactions.
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Lausch M, Spiess H. Deuteron spin alignment spectra of powders in presence of ultraslow motions. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0022-2364(83)90326-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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